Top 10 Undertale Bosses


The Top Ten

1 Sans Sans Sans or Sans the Skeleton is a character in the 2015 RPG Undertale created by Toby Fox. He is a lazy, pun-loving skeleton who is a supporting protagonist in the "pacifist" and "neutral" routes of Undertale, and a heroic antagonist/final boss of the "genocide" route. He is known for his incredibly difficult more.

Such a troll and the theme is so awesome I could listen to it for 10 weeks straight. I'm a lot like him too. I'm lazy and I can't stop making bad puns. I've listened to multiple versions of the song and all are rated over 1 million!

Sans was easy to beat for me even thought he was a lot harder to beat then the other bosses it honestly wasn't that hard though his pun are funny

Seems like a cool boss, but I haven't got anywhere near the heart that a Genocide run requires. - Garythesnail


V 17 Comments
2 Mettaton Mettaton Mettaton is a character in the popular 2015 RPG game, Undertale. He is a robot with a soul built by Dr. Alphys, and is the sole television star of the underground. Mettaton is a popular character in the fanbase. His notable features include his legs, and his catchphrase "OH YESSSS!"

All right! I think we were all expecting Sans but I definitely think Mettaton is the best. He also has by far the best theme song and of course the best legs.

Wow! It's cool to see him at number one! He's probably my favorite. - Garythesnail

NO! I thought Mettaton was winning! I mean just LOOK AT DEM LEGS! (and ratings too! )


V 17 Comments
3 Asriel Dreemurr Asriel Dreemurr Asriel Dreemurr is a character from the 2015 game "Undertale". He was created by Toby Fox. more.

He's not the hardest boss but it is an amazing showdown

The true ending boss

He's not very hard since you really can't lose, but he's the boss that'll probably pull on your heartstrings the most, only behind Asgore.

I love this character he is so cute! LoL my undertale crush. *^^*

V 5 Comments
4 Photoshop Flowey

First thing that comes to mind: WHAT IN THE NAME OF ALL THAT IS LIFE IS THAT?! This guy has no strategy, no mercy, just pure bullet hell. The only reason I don't really consider him top 3 worthy is because he really isn't that hard (unless you're doing a no-hit run, then good luck).

I sometimes wonder what Toby Fox was on when designing this boss. Like... no sane person or someone not doing drugs would create this. There is no way. - Rue

It is the longest fight in the game, so it has to be in the top three.

Phase two is amazing

V 2 Comments
5 Papyrus Papyrus Papyrus is a character from the 2015 game Undertale, made by Toby Fox . He is the Younger brother of Sans the skeleton, royal guard in training, and a sentry in the town of Snowdin . Opposite to his brother, papyrus is active, loud, and full of himself; but in an endearing way. Papyrus means to become more.

I truly love the Papyrus boss fight. Bonetrousle is one of my favorite pieces of music in Undertale and it's an extremely funny fight, especially considering that his dialogue is some of the funniest. What I truly love about Papyrus is that he refuses to kill anyone, which is one of the most sweetest things in any game... EVER! Well done, Toby Fox, for such an original character.

I love this boss but there is one downside, to spare him you just have to die to him 3 times (I think)

Papyrus is my favorite caricature in the game! And I got to saw that when I saw his boss fight it was funny and the dating thing was hilarious,but there are better fights in the game.


V 1 Comment
6 Undyne the Undying

Let's face it. I can't vote for sans because I have fought him yet. And do you know why? Because I can't get past Undyne. I mean, this boss fight is an amazing fight to get stuck on and then to curl up into a ball of despair because I can't beat it.

This fish lady is the 2nd hardest boss I have ever faced in a video game!

Why isn't she higher? This battle at least deserves to be in the Top 5. - BrokenLightbulb

This spearfish is the hardest thing ever.

V 3 Comments
7 Asgore Dreemurr

The epic opening, breaking mercy, forced to fight the kindest monster in the underground, his final words, the bitter end. no other boss represents Undertale better than Asgore

This is a boss that is not only difficult, it's a pretty emotional one. He's reluctant to fight, he can't even look at you in the eye, the music fills the atmosphere, his attacks weaken as your HP lowers, etc. enough said.

Undertale the game that makes you feel awfull for killing anything! But this was just worst. Asgore is my favorite and I didn't want to kill him
Stupid flower

8 Muffet Muffet Muffet is a character from the game Undertale. She appears in a region called Hotland, selling pastries to raise money to rent a heated limo to help the spider clan from the Ruins (who are also raising a bake sale) reunite with the one in Hotland because the spiders can't cross Snowdin.

Her song is one of the best I've heard in this game, her fight is innovative, it's fairly challenging, enough said.

Muffet is so awesome. I love her song, I love her design, I just love her. period.

Best when you suddenly end a genocide playthrough!

You can even skip this battle. The YouTuber I watched skipped it, and I usually HATE spiders, but today I did some research...

Best boss

9 Mad Dummy

This thing just looks funny, has great music, and overall is a really fun and hilarious boss fight. I love its attacks.

Undyne's training dummy. enough said.

10 Toriel Toriel Toriel is a main character in Toby Fox's 2016 RPG, Undertale. She is an amazing blend of goat and mother.

She's definitely one of the easiest bosses, but also one of those bosses that can really pull on your heartstrings.

She tries her hardest to keep u safe and she even gives u pacifist after the fight she hugs u and I find that very sweet.I also believe that she doesn't harm u after awhile in the pacifist fight not just because your on low health but because us words r got to her and she doesn't want to harm the way that's all thanks 4 reading
PS:sorry for abriviations

The Contenders

11 Alphys NEO
12 Greater Dog Greater Dog

All of the dogs in the game are so cute! - Pegasister12

Just throw a stick. Done.

13 Snowdrake's Mother


14 Undyne Undyne Undyne is a main character in Toby Fox's 2016 RPG, Undertale. She is the heroic fishlike captain of the Royal Guard, who takes it upon herself to protect the monsters of the Underground. Her name is derived from the word "Undine", and is a pun on the word "Undying". Her most loved monsters are her mentor, more.

Why is she down here her genocide fight is amazing

15 Disbelief Papyrus Disbelief Papyrus
16 Mad Mew Mew
17 Lemon Bread
18 Reaper Bird Reaper Bird
19 Memoryhead

This one totally gets my vote. THEY ABSORB ATTACKS! HOW AWESOME CAN YOU GET?!?

20 Glyde
21 Mettaton NEO

He looks cool...

22 Snowdrake
23 Endogeny Endogeny
24 Napstablook Napstablook Napstablook is a secondary character from Toby Fox's 2016 RPG, Undertale. He is the cousin of Mettaton, who left him in order to become famous. Due to this, poor Blooky has crippling depression.
25 So Sorry
26 Knight Knight

The dialogue is different. It says something.

27 Asgore Asgore Asgore Dreemurr is a boss monster and the king of the monsters in the 2015 RPG Undertale made by Toby Fox. Asgore is the portrayed main antagonist who plans to acquire seven human souls and use their power to break the barrier that seals the monsters underground . Aspects of his character are hinted more.

he amazing

28 Shyren
BAdd New Item

Related Lists

Top Ten Hardest Undertale Bosses Top 10 Easiest Undertale Bosses Top Ten Best Bosses in Sonic, Undertale, Five Nights at Freddy's, and Transformers Games Top 10 Fanmade Undertale Bosses Top Ten Best Undertale Characters

List Stats

300 votes
28 listings
2 years, 311 days old

Top Remixes (5)

1. Mettaton
2. Omega Flowey
3. Muffet
1. Photoshop Flowey
2. Sans
3. Mettaton
1. Photoshop Flowey
2. Mettaton
3. Papyrus

View All 5

Error Reporting

See a factual error in these listings? Report it here.